Ok this one is pretty stupid but here goes anyway...I have been tweaking boost past couple of days and yesturday when I put the car up for the night, checking for leaks, there was a bolt on the floor. It is abour 3/4 of an inch long, brass, about a 10mm, and has an 86 stamped on the head....For the life of me I can't figure out where it goes...all the oil pan bolts are accounted for, as are the water pump....Nothing is leaking....It just appeared, I am thinking it may have been lost in some nook somewhere and finally found its way loose. But thats a pretty risky assumption...anybody who has done a complete rebuild and might know where this bolt goes???